Global Positioning System (GPS)
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Transcript of Global Positioning System (GPS)
GPS Technology 1
Global Positioning System(GPS)
WDN PresentationCSN - SLIIT
GPS Technology 2
Team Members
1. Sachin Thishnika
2. Kusal Indika
3. Vidusha Rathnayaka
4. Nadeendra Yashaswin
5. Janaka Poddalgoda (Absent)
GPS Technology 3
Content
1. Introduction
2. What is GPS ?
3. How GPS Works
4. Applications of GPS
5. Drawbacks of GPS
6. Future Development
GPS Technology 4
Introduction
Navigation in early days North Star Compass LORAN & Decca Navigator
GPS project Developed under Department of
Defense
GPS is not alone
GPS Technology 5
What is GPS ?Global Navigation Satellite System
(GNSS)Provide
Position Timing Navigation
Three segments Space Control User
GPS Technology 6
What is GPS ? Cont.
Space segment 24 satellites At least six satellites on LOS
GPS Technology 7
What is GPS ? Cont.
Control Segment
Operate by US Air force
Consist of• Master Control Segment (MCS)• Alternative MCS• Dedicated ground antennas• Monitoring stations
GPS Technology 8
What is GPS ? Cont.
GPS Technology 9
What is GPS ? Cont.
User segment Consist of GPS receivers Calculate location using GPS signals
GPS Technology 10
How GPS WorksSatellite emit two signals
L1 (1575.42 MHz) UHF band – civil use L2 – (1227.60 MHz) - Military use Power 50w CDMA
GPS signal Pseudo random code Almanac data Ephemeris data
GPS Technology 11
How GPS Works
• Beacon –Radio Signal
• Travel time(t)=Sync of receive time – Satellite Time
• d=C*t
GPS Technology 12
How GPS Works Cont.
Triangulating
GPS Technology 13
Applications of GPS
GPS is an essential element of the global information infrastructure
It’s Free Open Dependable
“New uses of GPS are invented every day and are limited only by the human imagination.”
GPS Technology 14
Applications of GPS cont.
Aviation Cost effective solution Increase the safety and efficiency Three-dimensional positioning
GPS Technology 15
Applications of GPS cont.
Space Navigation solutions Altitude solutions Timing solutions & etc.
GPS Technology 16
Applications of GPS cont.
Survey & mapping Accuracy Reliability Interoperability
GPS Technology 17
Applications of GPS cont.
Differential GPS 10 meters to 10 centimeters Base station in known location Real-time DGPS
GPS Technology 18
Drawbacks of GPS
Signal multipath
Atmospheric effect
No GPS signals in Indoor Under water Under ground
Attacks
GPS Technology 19
Future Development
GPS III Enhanced signal reliability & accuracy L1C signal L2C signal Schedule to launch in 2015
GPS Technology 20
Future Development Cont.
No Selective Availability (SA)
GPS Technology 21
Future Development Cont.
L5 “safety-of-life” signal Two times powerful as L2C Focus on aviation & transportation Resistant to jamming & interference
High gain directional antenna 100 times more powerful than wide angle
antenna M-coded military signal
GPS Technology 22
Future Development Cont.
Cross platform receivers More accurate Fast convergence
GPS & GLONASS satellites
GPS Technology 23
GPS Technology 24